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Thread: Rough Opening for Door

  1. #1
    DIY Senior Member nelsonba's Avatar
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    Default Rough Opening for Door

    I'm planning to use some doors for my remodel project that are not pre-hung. (They were in my storage space and match the rest of the doors in the house). What would be the proper size rough opening for the framing? I assume I need enough space for the door jambs and some room for shimming. What would be the standard door jamb thickness? How much room do I need for shimming?

    Thanks

  2. #2
    Plumber jimbo's Avatar
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    Typically you would add 2" in width and height, but you should have the actual frame on hand, or specs for it, to be sure.

    A typical 36 X 80 door would be roughed at 38 X 82

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    DIY scratch-pad engineer leejosepho's Avatar
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    Quote Originally Posted by nelsonba View Post
    What would be the standard door jamb thickness?
    Usually 3/4", and with the inch Jimbo mentioned allowed for them.

    Quote Originally Posted by nelsonba View Post
    How much room do I need for shimming?
    The 1" allowance all-around should be more than enough unless the "rough framing" is a bit too "rough" and way-out-of-square.

    Use tapered shims in pairs with one coming in from each side so the net result is flat unless the lumber around your opening is twisted. Also, be sure to shim directly behind the hinges, if necessary, and to screw at least the top hinge all the way into the framing to keep the door edges plumb/parallel with the jamb.

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    In the Trades AZ Contractor's Avatar
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    Quote Originally Posted by leejosepho View Post


    The 1" allowance all-around should be more than enough unless the "rough framing" is a bit too "rough" and way-out-of-square.
    Where do you get 1"?

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    DIY scratch-pad engineer leejosepho's Avatar
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    Quote Originally Posted by AZ Contractor View Post
    Where do you get 1"?
    Quote Originally Posted by jimbo View Post
    Typically you would add 2" in width and height ...
    A typical 36 X 80 door would be roughed at 38 X 82
    What number or numbers do you use?

  6. #6
    In the Trades AZ Contractor's Avatar
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    Jimbo is correct. 36 inch door gets a 38" RO.

    35 3/4" door
    + 3/4" jamb
    + 3/4" jamb
    +3/16" gap on strike and hinge side.
    =37 5/8"


    the 38" RO gives you 3/8" of play.

    where do you get 1"?

  7. #7
    DIY scratch-pad engineer leejosepho's Avatar
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    Quote Originally Posted by AZ Contractor View Post
    where do you get 1"?
    38" - 36" = 2" (1" all-around)

    What part are you missing?

  8. #8
    DIY Senior Member Hube's Avatar
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    Quote Originally Posted by leejosepho View Post
    38" - 36" = 2" (1" all-around)

    What part are you missing?
    answer; it could be part of his brain that is missing

  9. #9
    DIY scratch-pad engineer leejosepho's Avatar
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    Oh, maybe it is something as simple as "all-around" being mistaken for "overall", eh?!

    Overall, we are talking about allowing an inch all-around ... yet I did recently frame a wall and install a 4'x6' window in my new workshop with only 1/4" clearance overall!

  10. #10
    In the Trades AZ Contractor's Avatar
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    Quote Originally Posted by leejosepho View Post
    Oh, maybe it is something as simple as "all-around" being mistaken for "overall", eh?!
    When you mentioned 1" all around and rough framing way out of square in the same breath it sounded like you were talking about shim space.

  11. #11
    Jack of all trades frenchie's Avatar
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    Quote Originally Posted by leejosepho View Post
    Oh, maybe it is something as simple as "all-around" being mistaken for "overall", eh?!

    Overall, we are talking about allowing an inch all-around ... yet I did recently frame a wall and install a 4'x6' window in my new workshop with only 1/4" clearance overall!
    As opposed to the 3/8ths AZContractor just explained...?
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  12. #12
    DIY scratch-pad engineer leejosepho's Avatar
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    Quote Originally Posted by AZ Contractor View Post
    When you mentioned 1" all around and rough framing way out of square in the same breath it sounded like you were talking about shim space.
    Ah, okay. I did not speak clearly while meaning to say 1" all-around the actual size of the door should leave enough room for jamb, shims and squaring, overall.

    Quote Originally Posted by frenchie View Post
    As opposed to the 3/8ths AZContractor just explained...?
    No, openings for windows are figured differently, but yes, 3/8" could have been okay.

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